This study involves a 7 week dose-response trial of Concerta™ methylphenidate for mothers of children with ADHD who have ADHD themselves. The aim of this study is to assess the efficacy of Concerta™ in improving adult ADHD symptoms and impairments (primary outcome), as well as observed and reported parenting (secondary outcome). The researchers hypothesize that Concerta™ will significantly decrease mothers ADHD symptoms and impairment, as well as improve observed and reported parenting